Totally original idea for a Graves skin:

http://1.bp.blogspot.com/-h4SbSRVZLEI/UcihGCgPF8I/AAAAAAAADOE/t1jytDAhUTE/s1600/John+Marston+(Bandito).jpg

Preferably the one on the left. Or even a mix between the left and the mid.

It doesn't make sense that the token Cowboy champion of LoL doesn't have a skin where he's wearing a cowboy hat.